No matter ____ difficult problems we meet,we won't fail unless we give up our hopes.這里用how還是what?為什么?
選what.因?yàn)閣hat是連接代詞,修飾名詞problems
如果句子是：No matter ____ difficult the problems we meet,we won't fail unless we give up our hopes
選how.因?yàn)閔ow是連接副詞修飾形容詞difficult
2.____ is like a small part of a machine.這里用we each還是each of us?為什么?
選each of us.因?yàn)橄祫?dòng)詞是is,主語就是單數(shù)each of us；而we each做主語是復(fù)數(shù),需要用復(fù)數(shù)的謂語動(dòng)詞/系動(dòng)詞are.